Zilla wrote: [quote=TheRealShotgun]...the only way you'd make sure two mics (or mic pairs) were "in phase" by keeping one 3 feet farther from the source than the other would be if the source was only exciting at 375.109.

Not exactly.

Let us not discriminate against 750.218, 1500.436, 3000.872, 6001.744, 12003.488, and 24006.976. This assuming that air pressure, temperature, and humidity are fixed (and, of course, they are not).

Indeed you are correct, sir. And we can add to that 187.5545, 93.77725 and any of the other multiples of the original.

Which means I really should apologize to CoyotePatties. I'm sorry, man, I had no idea you only worked in multiples of 375 Hz. My bad, dude.

~S

TheRealShotgun wrote: [quote=Zilla][quote=TheRealShotgun]...the only way you'd make sure two mics (or mic pairs) were "in phase" by keeping one 3 feet farther from the source than the other would be if the source was only exciting at 375.109.

Not exactly.

Let us not discriminate against 750.218, 1500.436, 3000.872, 6001.744, 12003.488, and 24006.976. This assuming that air pressure, temperature, and humidity are fixed (and, of course, they are not).

Indeed you are correct, sir. And we can add to that 187.5545, 93.77725 and any of the other multiples of the original.

Which means I really should apologize to CoyotePatties. I'm sorry, man, I had no idea you only worked in multiples of 375 Hz. My bad, dude.

~S

Actually, I'm afraid neither of you are correct.

Note - in Coyote's original post, he states:

Coyote wrote:
one of the pair is more than 1 foot further from the source than the other, you must then place the more distant mic at least 3 feet further from the source

So the first mic is 1 foot away, the other is 3 feet away. The delta between the mics is 2 feet, which equals roughly 562.5 Hz. But... since the wave would be arriving at the first mic at the mid-way point and at the second mic at the other midway point - they would be 180 degrees out of phase. So, 1125 Hz would be the safest starting point of frequencies.

J.